Nissan Leaf. Manual - part 579

EVC-340

< DTC/CIRCUIT DIAGNOSIS >

P31DC SYSTEM MAIN RELAY -

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-53, "Intermittent Incident"

.

NO

>> Repair or replace error-detected parts.

P31DD PRE-CHARGE RELAY

EVC-341

< DTC/CIRCUIT DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

EVC

N

O

P

P31DD PRE-CHARGE RELAY

DTC Logic

INFOID:0000000010120804

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

• Turn power switch OFF and wait at least 90 seconds.

CAUTION:

During this period, never perform vehicle handling such as opening and closing of doors. If some

kind of vehicle handling is performed, then wait another 90 seconds or more from the time of the

vehicle handling.

• Make sure that 12V battery voltage is 11 V or more.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Set the vehicle to READY and wait at least 5 seconds.

2. Check DTC.
Is DTC detected?

YES

>> Proceed to 

EVC-341, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010120805

1.

CHECK PRE-CHARGE RELAY DRIVE CIRCUIT-1

1. Turn power switch OFF.

2. Disconnect Li-ion battery harness connector.

3. Check continuity between Li-ion battery connector terminal and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO 

>> Check short circuit between Li-ion battery harness and ground.

2.

CHECK PRE-CHARGE RELAY DRIVE CIRCUIT-2

1. Disconnect VCM harness connector.

2. Check harness for short to ground, between VCM harness connector and Li-ion battery harness connec-

tor.

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P31DD

PRE CHARGE RELAY
(Pre-charge relay)

Pre-charge relay drive circuit remains short to ground for 
2.5 seconds or more.

• Harness or connectors

(Pre-charge relay drive cir-
cuit is shorted)

• Pre-charge relay

+

−

Continuity

Li-ion battery

Terminal

11

Ground

Not existed

EVC-342

< DTC/CIRCUIT DIAGNOSIS >

P31DD PRE-CHARGE RELAY

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-53, "Intermittent Incident"

.

NO

>> Repair or replace error-detected parts.

+

−

Continuity

Li-ion battery

Connector

Terminal

B89

11

Ground

Not existed

P31DE SYSTEM MAIN RELAY

EVC-343

< DTC/CIRCUIT DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

EVC

N

O

P

P31DE SYSTEM MAIN RELAY

DTC Logic

INFOID:0000000010120806

DTC DETECTION LOGIC

NOTE:

This DTC shows a forced system main relay disconnection by fail-safe.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

• Turn power switch OFF and wait at least 90 seconds.

CAUTION:

During this period, never perform vehicle handling such as opening and closing of doors. If some

kind of vehicle handling is performed, then wait another 90 seconds or more from the time of the

vehicle handling.

• Make sure that 12V battery voltage is 11 V or more.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Turn power switch ON and wait at least 10 seconds.

2. Check DTC.
Is DTC detected?

YES

>> Proceed to 

EVC-343, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010120807

1.

PERFORM SELF-DIAGNOSIS OF VCM

With CONSULT

Perform self-diagnosis of VCM.
Is DTC detected other than P31DE?

YES

>> Perform diagnosis procedure of detected DTC and then replace battery J/B. Refer to 

EVB-206,

"BATTERY JUNCTION BOX AND BATTERY HARNESS : Disassembly and Assembly"

.

NO

>> Replace Li-ion battery J/B. Refer to 

EVB-206, "BATTERY JUNCTION BOX AND BATTERY HAR-

NESS : Disassembly and Assembly"

.

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P31DE

HV BATT MAIN RELAY
(High voltage battery main re-
lay)

When the system main relay is shut off, VCM accumulates high 
voltage current value, and the accumulated value reaches the 
specified value.

• Li-ion battery J/B
• EV control system